Expansion bolt-anchor.



No. 896,'756. PATENTED AUG. 25, 1908. H. W. PLBISTER. EXPANSION BOLTANCHOR.

APPLICATION IILBDDEO. 19,1907.

W/TNESSES K I MENTOR 4i (,WL fi fj UNITED STATES PAtrENroFFIoE.

HENRY W. PLEISTER, or WESTFIELD, NEW JERSEY, AssIeNoR TO HENRY B.NEwHALn'oF PLAINFIELD, NEW JERSEY. 1

EXPANSION BOLT-ANCHOR.

Specification of LettersgPatent.

- Rat ented. Aug. 25, 1908.

Application filed December 19, 1907. Serial No. 407,125.

To all whom it may concern:

Be it known that I, HENRY W. PLEISTER, a citizen of the United States,and a resident of Westfield, in the county of Union and State of NewJersey, have invented certain new and useful Improvements in ExpansionBolt-Anchors, of which the following is a specification, taken inconnection with the accompanying drawings, which form a part of thesame. This invention relates to expansion bol anchors and moreparticularly to the means for expanding the shields and locking theparts together thereby preventing accidental separation of the parts -1nhandling, shipping or in use. I

In the accompanying drawings showing illustrative embodiments of thisinvention. and in which the same reference numeral refers to similarparts in the several figures, Figure 1 is a longitudinal section of mybolt anchor, theparts being shown in operative osition. Fig. 2 is a sideelevation ofthe olt anchor. Fig. 3 is an end elevation. Fig. 4. is aperspective view showing the parts slightly wedged apart for the purposeof better illustration.

In the illustrative embodiment of this invention shown in the drawing, 1is a support of masonry or any other material in which a hole 2 has beendrilled, or otherwise made,

for the reception of the expansion bolt anchor 3. This bolt anchor hastwo expansion shields 4 and 5 respectively and circumferential depressedgrooves 6 and 7 within which are mounted split spring rings 8 and 9 toyieldingly hold the two shields 4 and 5 together forming a substantiallycylindrical exterior, all as is usual in such devices.

At each end of the shields 4 and 5 I form a flaring mouth by means ofthe incline or wedge surfaces 10 and 11, Fig. 1, which 006 erate withthe complementary wedge surfaces upon the nut 12 and, sleeve 13. The nut12 is screw-threaded tocooperate with the threads 14 upon the bolt 15which, as shown in Fig. 1, supports a member 16.

To support and positively lock the nut 12 and sleeve 13 to the expansionshields and at the same time not interrupt or decrease the wedgingsurfaces 10 and 11 and the complementary-wedging surfaces upon the nutand sleeve, I form on, or otherwise secure to, the

. nut and sleeve arrow heads, or notched wedge surfaces 15 and 16.respectively. I

preferably employ two such arrow heads or wedge surfaces on each nutandsleeve arranged preferably 180 degrees apart. These arrow heads or wedgeand locking surfaces each consist of 'a shank 17 having wedge surfaces,a head 18 having wedge surfaces and shoulders 19, 19 located betweensaid wedge surfaces. on the shank and head. Each of the shields 4 and 5is cut awayat 20, 20 to form half if a seat or bearing for the head 18of the arrow head. These seats have ancillary wedge surfaces 21, 21which are ada ted to' 006 erate with the incline surfaces 0 the I arrowead to assist in forcing the shields 4 and 5 apart, supplementing thewedging action of the incllne surfaces 10 and 11 and the surfacescarried by the nut and sleeve.

On the edge and near the end of each shield, bu.t not interruptingtheincline wedge surfaces 10 and 11, I form lips 22, 22'whi'ch cooperatewith the wedge surfaces on the shank 17 and with the shoulders 19, 19 onthe arrow head locking the nut and sleeve to the shields 4 and 5 andpreventing accidental dis-.

engagement of the parts of the expansion bolt anchor.

To insure easy insertion of the arrow head in. its seat, against theaction of the s lit spring rings 9 and 8,. I preferably beve or flareoutwardly the li s 22, 22, as shown at 23. This surface 23 a socooperates with the wedge surfaces on the shank 17. To prevent theshields rotating in the hole 2 I preferably form longitudinal ribs 24,24 upon their exterior surface and I may also use transverse ribs 25,25, which will tend to prevent the and a shank having wedge surfaces,mounted upon the expanding member, and cooperating engaging surfacesupon the expansible member. adapted to engage with the wedge surfacesupon the head and shank of the ar-- .row head of arrow heads.

' 2. In an expansion bolt anchor, an exof shields, means to yieldinglyhold the panding member, an arrow head carried by shields together, anexpanding member, one the expanding member, and wedge surfaces 1 or morearrow heads upon the ex anding on the shank of the arrow head. member,Wedge surfaces on the Shani: of the 3. In an expansion bolt anchor, theconi- .arrow heads, surfaces on the shields to 006pbination of aplurality of shields, yielding erate with the Wedge surfaces of thearrow means to hold the shields together, an exheads and lips on theshields to cooperate panding member, a lug on the expanding with thewedge surfaces on the shank of the 20 menber having twlp sets ofexpanding Wedges arrow heads. an surfaces on t e shie ds or cooperatingwith the different wedge surfaces on the ex- HENRY PLEISTER' pandingmember. Witnesses:

4. In an expansion bolt anchor, a plurality MARGERY ADAMSON,

ALAN M. JOHNSON.

